3n눀-28n=20怎么解过程

2024-11-25 11:50:51
推荐回答(1个)
回答1:

3n^2-28n=20
3n^2-28n-20=0
(3n+2)(n-10)=0
3n+2=0或n-10=0
n=-2/3或n=10